High performance loose nanofiltration membranes obtained by a catechol-based route for efficient dye/salt separation
High performance loose nanofiltration membranes obtained by a catechol-based route for efficient dye/salt separation
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DOI：
10.1016/j.cej.2019.121982
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发表时间：
2019-11
影响因子：
15.1
通讯作者：
Jing Wang;Rongrong He;Xinwei Han;D. Jiao;J. Zhu;Feili Lai;Xiangting Liu;Jindun Liu;Yatao Zhang-Ya
中科院分区：
文献类型：
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作者：
Jing Wang;Rongrong He;Xinwei Han;D. Jiao;J. Zhu;Feili Lai;Xiangting Liu;Jindun Liu;Yatao Zhang-Ya
疏松纳滤膜具有良好的染料截留率和无机盐透过率，是染料/无机盐分离的理想膜系。本文采用贻贝启发的无溶剂法制备表面结构和性能可调的疏松纳滤膜。一种低成本的材料，1，2-二羟基苯（邻苯二酚），用于取代多巴胺的贻贝启发的表面涂层策略。在CuSO 4/H2 O2的辅助下，仅需10 min即可在聚醚砜（PES）基底上形成一层邻苯二酚/PEI涂层。以不同分子量的聚乙烯亚胺（PEI）为基底，通过改变邻苯二酚/PEI的比例和溶液沉积时间，制备了不同的涂膜。通过实验室规模的错流装置在4 bar的压力下测试膜的分离性能。特别地，LNM-3具有极低的水渗透性（24.5 LMH bar-1）和对浓度在1.0和50.0 g L-1之间的NaCl和Na 2SO 4的极低截留率。同时，LNM-3对不同类型的染料都表现出了良好的上级截留性能，在实际应用中显示了巨大的潜力。总的来说，这种无有机溶剂工艺和低成本化学品的方法可以为环境友好和经济的多功能松散纳滤膜的制造提供新的策略。
Loose nanofiltration membranes with excellent dye rejection and high inorganic salt transmission are promising for dye/salt separation. Herein, a mussel-inspired organic solvent-free method was chosen to prepare loose nanofiltration membranes with tunable surface structures and properties. A low-cost material, 1,2-dihydroxybenzene (catechol), was used to replace dopamine for the mussel-inspired surface coating strategy. With the assistance of CuSO4/H2O2, a catechol/PEI coating layer was formed on the polyethersulfone (PES) substrate in only 10 min. Through constructing the coating layer based on polyethylenimine (PEI) with different molecular weights, catechol/PEI ratios and solution deposition times, different membranes were obtained. The separation performance of the membrane is tested by a lab-scale crossflow setup under the pressure of 4 bar. Especially, LNM-3 have an ultrahigh water permeability (24.5 LMH bar−1) and an extremely low rejection for both NaCl and Na2SO4in the concentrations between 1.0 and 50.0 g L−1. Meanwhile, LNM-3 shows superior rejection for different types of dyes, demonstrating their great potential in practical applications. Overall, such an approach enabled by an organic solvent-free process and low-cost chemicals may offer a new strategy for the environmental-friendly and economical manufacturing of multifunctional loose nanofiltration membrane.